Re: [Qemu-devel] [Qemu-block] [PATCH v9 02/31] block: Use children list in bdrv_refresh_filename

[Max Reitz]

On 2018-07-19 14:47, Ari Sundholm wrote:
> Hi!
> 
> On 06/28/2018 03:07 AM, Max Reitz wrote:
>> bdrv_refresh_filename() should invoke itself recursively on all
>> children, not just on file.
>>
>> With that change, we can remove the manual invocations in blkverify,
>> quorum, commit, and mirror.
>>
>> Signed-off-by: Max Reitz <address@hidden>
>> Reviewed-by: Alberto Garcia <address@hidden>
>> Reviewed-by: Kevin Wolf <address@hidden>
>> ---
>>   block.c           | 9 +++++----
>>   block/blkverify.c | 3 ---
>>   block/commit.c    | 1 -
>>   block/mirror.c    | 1 -
>>   block/quorum.c    | 1 -
>>   5 files changed, 5 insertions(+), 10 deletions(-)
>>
>> diff --git a/block.c b/block.c
>> index e418c97423..52247062d5 100644
>> --- a/block.c
>> +++ b/block.c
>> @@ -5174,16 +5174,17 @@ static bool append_open_options(QDict *d,
>> BlockDriverState *bs)
>>   void bdrv_refresh_filename(BlockDriverState *bs)
>>   {
>>       BlockDriver *drv = bs->drv;
>> +    BdrvChild *child;
>>       QDict *opts;
>>         if (!drv) {
>>           return;
>>       }
>>   -    /* This BDS's file name will most probably depend on its file's
>> name, so
>> -     * refresh that first */
>> -    if (bs->file) {
>> -        bdrv_refresh_filename(bs->file->bs);
>> +    /* This BDS's file name may depend on any of its children's file
>> names, so
>> +     * refresh those first */
>> +    QLIST_FOREACH(child, &bs->children, next) {
>> +        bdrv_refresh_filename(child->bs);
>>       }
>>         if (drv->bdrv_refresh_filename) {
>> diff --git a/block/blkverify.c b/block/blkverify.c
>> index da97ee5927..4a18baaf20 100644
>> --- a/block/blkverify.c
>> +++ b/block/blkverify.c
>> @@ -285,9 +285,6 @@ static void
>> blkverify_refresh_filename(BlockDriverState *bs, QDict *options)
>>   {
>>       BDRVBlkverifyState *s = bs->opaque;
>>   -    /* bs->file->bs has already been refreshed */
>> -    bdrv_refresh_filename(s->test_file->bs);
>> -
>>       if (bs->file->bs->full_open_options
>>           && s->test_file->bs->full_open_options)
>>       {
>> diff --git a/block/commit.c b/block/commit.c
>> index e1814d9693..26db55d800 100644
>> --- a/block/commit.c
>> +++ b/block/commit.c
>> @@ -234,7 +234,6 @@ static int coroutine_fn
>> bdrv_commit_top_preadv(BlockDriverState *bs,
>>     static void bdrv_commit_top_refresh_filename(BlockDriverState *bs,
>> QDict *opts)
>>   {
>> -    bdrv_refresh_filename(bs->backing->bs);
>>       pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
>>               bs->backing->bs->filename);
>>   }
>> diff --git a/block/mirror.c b/block/mirror.c
>> index 61bd9f3cf1..2f5ccae2b1 100644
>> --- a/block/mirror.c
>> +++ b/block/mirror.c
>> @@ -1421,7 +1421,6 @@ static void
>> bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts)
>>            * bdrv_set_backing_hd */
>>           return;
>>       }
>> -    bdrv_refresh_filename(bs->backing->bs);
>>       pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
>>               bs->backing->bs->filename);
>>   }
>> diff --git a/block/quorum.c b/block/quorum.c
>> index 9152da8c58..03388590f3 100644
>> --- a/block/quorum.c
>> +++ b/block/quorum.c
>> @@ -1080,7 +1080,6 @@ static void
>> quorum_refresh_filename(BlockDriverState *bs, QDict *options)
>>       int i;
>>         for (i = 0; i < s->num_children; i++) {
>> -        bdrv_refresh_filename(s->children[i]->bs);
>>           if (!s->children[i]->bs->full_open_options) {
>>               return;
>>           }
>>
> 
> Should blklogwrites not also receive the same treatment?

Probably, but how could I have known before blklogwrites was in? :-)

Max

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